Tension for sewing-machines



No Model.)

G. A. BRADY.

TENSION FOR SEWING MACHINES. No. 277,449. Y Patented May 15,1883.

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GILBERT BRADY, OF CHICAGO, ILLINOIS.

TENSION FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 277,449, dated May 15, 1883. Application filed May 15, 1 882. No model.)

To all whom it may concern:

Be it known that I, GILBERT A. BRADY, of Chicago, in the county of Cook and State. of Illinois, have invented certain new and useful Improvements in Tensions for Sewing-Machines, ofvwhich the following, in connection with the accompanying drawings, is a specification.

In the drawings, Figure l is a side elevation of a sewing-machine tension embodying my invention. Fig. 2 is a top view thereof, and Fig. 3 is a side elevation of the same somewhat modified in construction.

Like letters of reference indicate like parts.

A represents a tension-stand. B and B are tension-plates, and G is a tension-regulating screw. D and D are anti-friction rollers, applied, respectively, to those ends of the tensionplates from which the thread is drawn when the tension is in use, and it is to be understood that the thread then passes between the said rollers.

With the exception of the rollers B and B, the tension may be made in any way suited to tensions of the class shown. For example, only one tension-plate need be employed, as indicated in Fig. 3, in which case the lower roller, D, may be applied directly to the tensionstand, as there shown; also, any well-known or suitable release device or liberator may be employed. In the drawings, E represents a release device or liberator, which consists of a lever pivoted at one end, as shown in Figs. 1 and 2, to the plate B, and bearing near its central part on the lower plate. In Fig. 3 this lever is shown as pivoted between its ends to the only plate there shown, and its lower end is represented as bearing on the stand. It will be perceived that the rollers D and D will in both cases be separated from each other enough to liberate the thread by bearing down on the lever E.

, Eleretofore, so far as I am aware, the thread has been so pinched or pressed by tensions of this class that it was liable to be kinked behind the point of compression, the pressure tending to unroll the twist and push it back, thus mak- ..ing the tension operate unevenly. The purpose of my present invention is to cure this defect, and this I am, to accomplish by employing the rollers D D substantially in the manner shown and now described.

Having thus described my invention, whatI claim as new, and desire to secure by Letters Patent, is-

The combination, in a plate-tension for sewing-machines, of the anti-friction rollers D and D, a spring tension-plate, in the forward end of which is journaled one of the said rollers, located above and for contact with the other of the said rollers, and the tension-screw (1, all adapted for operation together, substantially as specified, and for the purposes set forth.

GILBERT A. BRADY.

Witnesses:

F. F. WARNER, H. FRANKFURTEE. 

